Abstract
We have been investigating particle flocculation using ultrasound in water. Irradiating kHz-band ultrasound, sub-mm-order/mm-order particles were flocculated in spherical form at a fixed position. This flocculation was caused by Acoustic Cavitation-Oriented Bubbles (ACOBs). The ACOBs were generated by the acoustic pressure amplitude. In this study, changing the component ratio of the dissolved gases (air/CO_2) in water, we evaluated the relationship between the particle flocculation patterns and the ACOBs. In air-dissolved water, the spherical flocculation was formed. On the other hand, in CO_2-dissolved water, the line-like flocculation was formed. The difference arose from the differences in motion between air bubble and CO_2 bubble. In this report, we explained the relationship between the particle flocculation patterns and the component ratio of dissolved gases in water.
